Function: invert(numbers("yyy") if 2 *(numbers("yxx")) > numbers("yxx") else numbers("per")) if logn(invert(numbers("yxx") if 2 *(numbers("yxx")) > numbers("per") else numbers("yyy"))) > 2 *(numbers("yxx")) else numbers("yyy") if 2 *(numbers("yxx")) > numbers("yxx") else numbers("per")
